With the c language of 4* 4 keyboard input detection. To do with the AT89C51 microcontroller control chip, the program using keil write, experimental simulation has protel99se realized, has been successfully verified, the document contains source code and simulation files.

实验十四4X4键盘\STARTUP.A51
...............\Led14keil.plg
...............\Led4.c
...............\STARTUP.obj
...............\STARTUP.lst
...............\Led4.LST
...............\Led4.OBJ
...............\Led14keil.M51
...............\Led14keil.hex
...............\Last Loaded led14.DBK
...............\led14.dsn
...............\led14.PWI
...............\Led14keil_Uv2.Bak
...............\Led14keil.Uv2
...............\Led14keil_Opt.Bak
...............\Led14keil.Opt
实验十四4X4键盘

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